netdev - RE: [PATCH net] netxen: fix netxen_nic

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Date:	Fri, 23 Jan 2015 10:59:19 +0000
From:	Manish Chopra <manish.chopra@...gic.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	David Miller <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>
Subject: RE: [PATCH net] netxen: fix netxen_nic_poll() logic

> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Thursday, January 22, 2015 9:26 PM
> To: Mike Galbraith; David Miller
> Cc: netdev; Manish Chopra
> Subject: [PATCH net] netxen: fix netxen_nic_poll() logic
> 
> From: Eric Dumazet <edumazet@...gle.com>
> 
> NAPI poll logic now enforces that a poller returns exactly the budget when it
> wants to be called again.
> 
> If a driver limits TX completion, it has to return budget as well when the limit is
> hit, not the number of received packets.
> 
> Reported-and-tested-by: Mike Galbraith <umgwanakikbuti@...il.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Fixes: d75b1ade567f ("net: less interrupt masking in NAPI")
> Cc: Manish Chopra <manish.chopra@...gic.com>
> ---
>  drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
> b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
> index 613037584d08..c531c8ae1be4 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
> @@ -2388,7 +2388,10 @@ static int netxen_nic_poll(struct napi_struct *napi,
> int budget)
> 
>  	work_done = netxen_process_rcv_ring(sds_ring, budget);
> 
> -	if ((work_done < budget) && tx_complete) {
> +	if (!tx_complete)
> +		work_done = budget;
> +
> +	if (work_done < budget) {
>  		napi_complete(&sds_ring->napi);
>  		if (test_bit(__NX_DEV_UP, &adapter->state))
>  			netxen_nic_enable_int(sds_ring);
> 
Thanks Eric.
Acked-by: Manish Chopra <manish.chopra@...gic.com>